The only [at grade] railway crossing for Tokyo Metro?
Oh no, Tokyo Metro owns several lines and many of those lines still have dangerous (but cool) street-level crossings, even deep within the city.
My favorite factoid about the Ginza Line is that the Shibuya Terminal, and the entire last leg of the line, was recently moved.
Because Shibuya has been completely transformed in the last ten years, Tokyo Metro Shibuya Station was moved out of one building and rerouted into another building. Not only is Tokyo Metro Shibuya Station brand new, it’s a much larger bay-style station that gets sunlight from a glass canopy. A huge departure from the completely enclosed and narrow tomb it used to be.